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Harnessing dislocation motion using an electric field
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DOI：10.1038/s41563-023-01572-7.png)
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摘要
En 中文
Dislocation motion, an important mechanism underlying crystal plasticity, is critical for the hardening, processing and application of a wide range of structural and functional materials. For decades, the movement of dislocations has been widely observed in crystalline solids under mechanical loading. However, the goal of manipulating dislocation motion via a non-mechanical field alone remains elusive. Here we present real-time observations of dislocation motion controlled solely by using an external electric field in single-crystalline zinc sulfide-the dislocations can move back and forth depending on the direction of the electric field. We reveal the non-stoichiometric nature of dislocation cores and determine their charge characteristics. Both negatively and positively charged dislocations are directly resolved, and their glide barriers decrease under an electric field, explaining the experimental observations. This study provides direct evidence of dislocation dynamics controlled by a non-mechanical stimulus and opens up the possibility of modulating dislocation-related properties. A method to manipulate the dislocation motion via a non-mechanical field alone has remained elusive. Here, using in situ TEM, it is directly observed that dislocation motion can be controlled solely by an external electric field.
Keyword:
TOTAL-ENERGY CALCULATIONS
ELASTIC BAND METHOD
CHARGED DISLOCATIONS
PLASTIC-DEFORMATION
MOLECULAR-DYNAMICS
EDGE DISLOCATIONS
SEMICONDUCTORS
MOBILITY
DRIVEN
RECONSTRUCTION
期刊
IF:
38.5
论文数:
6.8K
被引数:
11.5W
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